Rotary file



NOV. 23, 1954 HAGEN 2,6@4,85

ROTARY FILE Filed Jan. 29, 1952 INVEN United States Patent'() "ROTARYFILE William F.-Hagen, Eastbrange,--N. J. Application January 29, f1:9"52,1 Seriiil"N0. 26 85797 .1 Claim. (Cl. 29%79) This'invention relatesto cutters for use on sand'ersor grinders 'used normally in sandiri'g'or grinding "wood, plastic, soft {metal objects or-the like, such as inpattern making shops, etc.

Spindle sanders -or grinders'utiliiin'g :rotary spindles,

some carrying rubber expanding drums Ifitted with abrasive sleeves ofsand paper; garnet paper or like abrasives, and disc sanders-or;grinders utilizing r otary discs having abrasive discs of sand,garnet paper or like abrasives are commonly used in pattern makingshops, .woodfa'rid relatively soft metal working .S 1i S, plasticfabricating shops, by hobbyistsand *the like for finishing and oftenforming articles of various materials. Such machines provide accurate,quick and easy working of the material and result in substantial savingsin labor and time. However, the abrasive surfaces of the abrasivesleeves and discs, being of what is commonly known as sand paper, wearrapidly, become clogged with pitch and otherwise rendered unusable aftervery short time periods of use, requiring frequent changing of theabrasive sleeves or discs with the loss of operating time of themachine,

labor costs of changing the abrasive member together with the cost ofthe numerous abrasive members used.

An object of the present invention is to provide a cutter which willperform all of the functions of the abrasive members used on suchmachines in at least a satisfactorily equal manner, in which while theinitial cost thereof may be slightly in excess of the initial cost ofeach abrasive sleeve or disc now in use, will outlast many such abrasivemembers and thereby more than compensate for any slight increase ininitial cost by not only the savings in the cost of the large numbers ofabrasive members which it will replace, but will very materially reducelabor costs and time losses occasioned by changing the abrasive members.

Specifically, the invention comprehends a cutter to L replace abrasivemembers used in such machines which includes a metal carrying spindlehaving a plurality of hack saw or band saw elements or analogous devicescarried thereby, the teeth or cutting surfaces on the edges of whichprotrude slightly from the surface of the spindle to provide the cuttingor grinding action normally provided by abrasive surfaces of theabrasive members.

With these and other objects in view, as may appear from theaccompanying specification, the invention con sists of various featuresof construction and combination of parts, which will be first describedin connection with the accompanying drawings, showing a cutter for useon sanding or grinding machines of a preferred form embodying theinvention, and the features forming the invention will be specificallypointed out in the claims.

In the drawings:

Figure 1 is a side elevation of the cutter for use on a spindle typesanding machine showing parts thereof broken away.

Figure 2 is a cross section on the line 2-2 of Figure 1.

Figure 3 is an enlarged fragmentary section of the cutter.

Figure 4 is a cross section taken on the line 4-4 of Figure 3.

Figure 5 is a perspective view of a holding cap used in the cutter forholding the cutter blades in position.

Figure 6 is a fragmentary view of a modified form of the cutting blade.

2,694,850 Patented Nov. '23, 1954 Figure 7 is a fragmentary view ofanother type of cutting blade.

Figure 8 is a cross section on the line '8-8 of Figure 7.

Figure 9 is a simplified side elevation of a spindle grinder-0r sanderof the'type on which the cutter is employed.

Referring more particularly to the drawings and the spindle t-ype cutter'shown in Figures 1 to 9 inclusive, a spindle type sander =or grinder onwhich the cutter is applicable for use includes a rotary'chuck 1 whichis rotated about a vertical axis by any suitable type of power means(not shown). The chuck 1 removably receives a spindle 2 which has acollar-3 rigid thereon. The upper end of the spindle 2 is threaded asshown at '4 and a nut 5 is 'thr'eaded thereon. The cutter generieall-yreferred to by the numeral -10 has an axial bore 11 by means of Whichitis mountedupon the spindle 2 with its lower end resting upon the collar3 and the nut 5 is then threaded upon thethreaded end 4 of the spindle'2 to securely clamp the cutter 10 upon the spindle against independentmovement relative to the spindle.

The cutter 10 includes a cylindrical carrier 12 which may be of met'alor any other suitable material and it has a plurality of radial slots 13cut therein and open ing out through its outer surface. The slots 13 areof such depth that the cutter blades 14 will fit snugly therein withtheir inner or back "edges fitting tightly against the inner-ends of theslot. In Figures 1 to 4 inclusive of the drawings the cutter blades 14are shown as being hack saw blades of the usual type purchased upon theopen market and having cutting teeth 15 formed on their cutting edges.The teeth 15 of a hack saw blade are inclined longitudinally in onedirection as clearly shown in Figures 1 and 3 of the drawings. This isthe usual construction of hack saw blade. The teeth 15 also have what iscommonly known as set, that is, they are bent laterally slightly, asclearly shown in Figure 4 of the drawings. Also, as clearly shown inFigures 2 and 4 of the drawings, the outer ends of the slots 13 areenlarged for a short distance inwardly from the outer surface of thecylindrical carrier 12, as shown at 16, to accommodate the set of teeth15. The slots 13 are of such depth that the teeth of the saw blade orcutter blade will protrude slightly beyond the outer surface of thecylindrical carrier 12. To provide the best results it has been foundthat the teeth should protrude approximately .10 to .015 inch beyond theouter surface of the cylindrical carrier 12 and wherever the termslightly is used in the specification and claims it is to be understoodit means approximately these distances.

Hack saw blades have rounded ends as clearly shown at 17 in Figures 1and 3 of the drawings and holding caps 18 are provided for engagementwith the ends of the cylindrical carrier 12 and the ends of the cutterblades 14 to securely hold the cutter blades in position and preventtheir movement relative to the carrier 12. The holding caps 18 have flatouter surfaces 19 which engage either the collar 3, the nut 5, or awasher 20, particularly between the nut 5 and the holding cap 18. Theinner surface of the holding caps 18 is cut away as shown at 21providing concave portions 22 near the perimeter of the holding cap. Theconcave portions 22 are curved so that when the holding caps 18 areclamped against the ends of the cylindrical carrier 12 and thecylindrical carrier 12 is securely held in position on the spindle 2 bymeans of the nut 5 and collar 3 the holding caps will tightly and snuglyfit the curved ends of the cutter blades 14 thereby preventingdisplacement of the cutter blades.

While the above description and drawings show the cutter blades as beinghack saw blades with rounded ends, it is to be understood that band sawblade sections or similar cutter blades may be employed withoutdeparting from the spirit of the present invention and that in suchcases the blades may have square ends instead of round so that thepresent invention comprehends the holding caps having recesses in theirinner surfaces the contour of the walls of which recesses are so shapedas to tightly fit against the ends of the cutter blades to hold them inposition.

In Figure 6 of the drawings the teeth 15 of the cutter blade 14 havetheir points indicated by dotted lines, cut or ground away, so as toprovide straight, sharp outer edges 24 which are parallel to the planeof the longitudinal axis of the cutter blade or are parallel to the backedge of the cutter blade.

Figure 7 of the drawings shows a further modified form of the cutterblade. In this figure and in Figure 8 the cutter blade 25 which fits inthe radial grooves or slots in the cylindrical carrier 12 have straightcontinuous flat outer edges as shown at 26, i. e., they are free ofteeth and the cutting is provided by the sharp corners of the cuttingedges of the blade.

In inserting toothed cutter blades in the slots in the cylindricalcarrier 12 it is desirable to face the teeth of one cutter in theopposite direction to the teeth of the adjacent cutter as is clearlyshown at the left-hand side of Figure 1 of the drawings, thus providingover lapping of the cutting action of the teeth of the cutter blade soas to provide a smooth finish on the material being worked upon. If itis so desired, cutter blades having teeth such as the cutter blades 14and cutter blades having the straight untoothed cutting edge such as thecutter blades 25 may be used alternately or in any desired relation inthe carrier head to provide quick cutting by the toothed blades andsmoothing action by the straight edged blades.

It will be understood that the invention is not to be limited to thespecific construction or arrangement of parts shown, but that within theinvention defined by the claim.

What is claimed is:

A cutter for use on a sanding or grinding machine inthey may be widelymodified eluding a rotary spindle, comprising a cylindrical carrierhaving a plurality of circumferentially spaced longitudinal slotstherein, cutter blades inserted in said slots and having their cuttingedges projecting slightly from the outer surface of the cylindricalcarrier, said cutter blades having inclined cutting teeth on theircutting edges with all of the teeth of each blade inclinedlongitudinally of the blade in the same direction, and wherein thecutter blades carried by the carrier are arranged so that the teeth ofone blade inclines in the opposite direction of the teeth of an adjacentblade, said teeth being set laterally as in a saw blade, said slotsbeing enlarged near the working surfaces of the carrier to accommodatethe set of the teeth.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 842,903 Napier Feb. 5, 1907 927,846 Flett July 13, 19091,379,146 West et al. May 24, 1921 1,395,309 Taber Nov. 1, 19211,856,887 Scheppy May 3, 1932 2,205,343 Carelli June 18, 1940 FOREIGNPATENTS Number Country Date 372,215 Germany Mar. 23, 1923 505,442 GreatBritain May 10, 1939

